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I Know Why (And So Do You) in G
Key of G
G major is the singer-songwriter's key. The open G, B, and D strings spell out the full G major triad with zero fretting. Add the open high E for a Gadd6 shimmer. Nearly every diatonic chord (Em, Am, C, D) has a comfortable open voicing. G is a beginner-level key on guitar because the open G, B, and D strings form a complete G major triad without fretting a single note, and the open low E adds a rich 6th color. Beginners will find this key approachable since most chords use open voicings with minimal stretching.
Voice Leading
The bass line moves through E to G (ascending minor third), G to D (descending perfect fourth), D to A (descending perfect fourth), A to G (descending whole step), G to B (ascending major third), B to C (ascending half step), C to B (descending half step), B to E (ascending perfect fourth), E to D (descending whole step), D to A (descending perfect fourth), A to D (ascending perfect fourth), D to A (descending perfect fourth), A to E (descending perfect fourth), E to A (ascending perfect fourth), A to G (descending whole step), G to F# (descending half step), F# to B (ascending perfect fourth), B to G# (descending minor third), G# to F# (descending whole step), F# to B (ascending perfect fourth). A half-step bass movement creates a strong leading-tone pull that demands resolution. The root motion by larger intervals (fourths and fifths) gives each chord change a strong, decisive character. When the progression loops, the bass returns from B to E by perfect fourth.
Scales for Improvisation
G major pentatonic works because every note is either a chord tone or a safe passing tone — there are no avoid notes. For soloing, this means you can play freely without clashing. Over dominant seventh chords, G Mixolydian adds the flat seventh for an authentic blues-rock edge.